I've been running the M44 tune since June 2011. I've put 35k miles on the car in that time and had absolutely no issues related to the dme. I never had the car dyno'd but I remember feeling a nice bump in midrange power. It was definitely a noticeable difference. __________________ ~Dave~ 98 328ti Morea Grun slicktop 11 128i space gray slicktop 13 JGC WK2 Deep Cherry Search | RealOEM |